Rein CHK0009P Radiator Coolant Hose Kit - Lower or Lower - Radiator To Thermostat

OE-Style BMW Radiator Hose Kit

Rein CHK0009P is a direct-fit radiator coolant hose kit for select BMW applications, built to match the original hose shape, branch layout, and quick-connect design. It includes a pre-installed temperature sensor to reduce installation time and avoid reusing aging sensor components.

• Application-specific fit for select BMW 545i, 645Ci, 745i, 745Li, 750i, and 750Li models
• Pre-installed temperature sensor helps reduce repeat repairs from reused sensors
• Direct replacement for OE hose assemblies with thermoplastic quick-connect fittings
• EPDM hose construction resists heat, salt, road debris, oil, and other contaminants
• No cutting, refitting, or adjusting required during installation
• Built to SAE J20R4 -D1 standards

Detailed Product Overview

Rein CHK0009P is a radiator coolant hose kit engineered for European vehicles that require an OE-style lower hose assembly. The hose follows the original routing and connection points, including the quick-connect ends and sensor location, so it installs like the factory part on BMW 545i, BMW 645Ci, BMW 745i, BMW 745Li, BMW 750i, and BMW 750Li applications. The pre-installed temperature sensor is included to simplify service and help avoid leaks or electrical issues caused by reusing old components. Rein CHK0009P is a practical choice for technicians replacing a lower radiator-to-thermostat hose on BMW cooling systems.

Common Problems This Part Addresses

• Coolant leaks at worn hose ends or quick-connect fittings
• Repeat repairs caused by reusing old o-rings, connectors, or sensors
• Extended installation time from transferring the temperature sensor
• Fitment issues from trimming or modifying a non-OE hose
• Cooling system service on BMW lower radiator-to-thermostat hose applications

Installation Notes and Tips

Verify the vehicle’s hose routing, sensor location, and connector style before installation. This hose is application specific and uses OE-style quick connectors, so the factory-style connection points should be matched exactly. For best results, inspect mating surfaces and related cooling system components for wear before assembly. Fits 2006-2008 BMW 750i, lower radiator to thermostat; fits 2006-2008 BMW 750Li, lower radiator to thermostat; fits 2004-2005 BMW 545i, lower; fits 2004-2005 BMW 645Ci, lower; fits 2002-2005 BMW 745i, lower radiator to thermostat; fits 2002-2005 BMW 745Li, lower radiator to thermostat.

Quality Assurance

Rein designs this hose as an OE-quality direct replacement for European vehicles, with dimensions and connector details matched to the original assembly. The EPDM construction meets SAE J20R4 -D1 requirements, and the pre-installed sensor supports a cleaner service process on BMW cooling system repairs. Part number CHK0009P is built for factory-style fitment on the listed applications.